Ventilator



April 8, 1924; 1,489,886

E. J. HART ET AL --VENTILATOR Filed Sept. 27; 1919 ffivnidra Zaamardffarf Jamal. fliwyfln Patented Apr. 8, i924.

EDWARD J. HART AND JAMES L MORGAN, 0i PHILADELPHIA, PENNSYLVANIA.

VENTILATOR.

Application filed September 27, 1919. Serial No. 326,792.

To all whom it may concern.

Be it known that we, EDWARD J. HART and JAMES L. MoneAN, citizens of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new and useful lmmovements in Ventilators, of which the following is a specification.

Our invention relates to anew and useitul improvement in ventilators, and has l or its object to provide an exceedingly, simple and effective device of this "description which will prevent the down flow oi air therethrough and which will accelerate the up flow of air.

A further object of our invention is to so construct the device that it will provide relatively large intake openings for the inlowing draughts, which openings are gradually reduced in area so as to add speed to the currents of air issuing from the top thereof between the blades and thus produce a pronounced induced draught within the ventilator; said blades being set upon spirals so as to give a rotary motion to the currents flowing therethrough.

Another object of the invention is to so construct a ventilator comprising a cylindrical body, spiral blades carried thereby, the upper ends projecting above the body and a skirt surrounding the blades with its upper edge approximately on line with the upper ends of the blades so as to be above the body and having its lower edge terminating short of the lower ends of the blades so that the latter project below the skirt.

Vith these ends in view, this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claim.

In order that those skilled in the art to which this invention appertains, may understand how tomake and use the same, I will describe its construction in detail, referring by numerals to the accompanying drawings forming a part of this application, in which Fig. l, is a central vertical section of a ventilator made in accordance with our improvements.

Fig. 2, is a bottom plan view, a portion being partly broken away and sectioned so as to more clearly show the position of the blades.

In carrying out our invention as here embodied, 1 represents the body of the ventilator preferably of cylindrical tor m having a base 2 which is adapted to lit over the opening leading from the space to be ventilated. or upon a chimney.

To the outer walls of the body 1 are secured the blades 3 in any suitable manner sucl'i as by riveting as indicated at at and these blades are set upon spiral lines their width "raduall taoerin from the bottom to the top thereoi so as to produce passageways between the blades which will be of larger capacity at their lower or intake ends than at their upper or outlet ends, and these blades project above the edge of the body.

5 represents the skirt or housing fitted over the blades and secured thereto in any convenient manner such as by riveting as indicated at 6 and this skirt is in the form of a truncated cone so as to conform with the outer edges of the blades thus completing the enclosure of the passageway between said blades. The lower edge of this skirt terminates short of the lower ends of the blades so that the latter project below the skirt.

7 represents a secondary hood which serves as a bafiie plate to prevent currents of air from blowing down the ventilator and this hood is secured over the upper end of the.

body 1 by the standards 8 and has a central opening 9 therethrough for the passage of the air currents.

10 represents the primary hood which is supported by the standards 11 and is cone shaped to shed the outside currents of air thereby preventing them from passing down the ventilator. By this construction it will be seen that outside currents of air blowing in any direction will enter the passageways between the blades 3 and on account of the shape of these passageways the speed of the air currents will be gradually accelerated as they pass upward therethrough and when they finally issue from the upper ends of these passageways they will be converged by the secondary hood 7 to the central opening through the same. This will create an induced draught in the body 1 thereby drawing the foul air from a room with which the ventilator communicates or smoke from a chimney in larger degrees than has heretofore been accomplished by such devices.

It is to be noted that the entire space enclosed by the skirt 5 is divided into air passageways of equal dimensions so that all of the air entering this space 1s affected 1n the same manner in its upward travel and also that the blades projecting below the cap, the

outside currents of air blowing against the ventilator will be arrested and caused to move upward within the cap with relatively considerable force, and in practice this construction has been found to produce a ventilator of high efficiency.

As the upper edge of the skirt projects above the body, any outside air currents entering the space between the upper edge of the skirt and the secondary hood, will, at least in the majority of cases, pass over the top of the body and strike the inner surface of the skirt at a point opposite where they entered, from where they will be carried downward between skirt and body, thus preventing their passage down the ventilator.

Of course we do not wish to be limited to the exact details of construction as herein shown as these may be varied within the limits of the appended claim without departing from the spirit of our invention.

Having thus fully described our invention, what we claim as new and useful is A ventilator comprising, in combination, a cylindrical body, a truncated conical skirt surrounding said body to enclose the major upper portion thereof and spaced therefrom, the upper edge of said skirt projecting slightly above said body to deflect currents of air downward between it and the body, and spiral blades located within the space between the body and skirt and running lengthwise of said body, the upper ends of said blades terminating at the upper edge of the skirt and forming helical passageways for the flow of air longitudinally of the body outside thereof.

In testimony whereof, we have hereunto aflixed our signatures.

EDWVARD J. HART. JAMES L. MORGAN. 

